Geoid definition
The hypothetical surface of the earth that coincides everywhere with mean sea level.
noun
The hypothetical surface of the Earth that coincides everywhere with mean sea level and is perpendicular, at every point, to the direction of gravity. The geoid is used as a reference surface for astronomical measurements and for the accurate measurement of elevations on the Earth's surface.
In geodesy, the earth viewed as a hypothetical ellipsoid with the surface represented as a mean sea level.
noun
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Other Word Forms
Noun
Singular:
geoid
Plural:
geoidsOrigin of geoid
- German from Greek geoeidēs earthlike gē earth -oeidēs -oid
From American Heritage Dictionary of the English Language, 5th Edition